September 3, 2020

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At first, it seemed that a relatively simple post would adequately review what is on the continent. The monogenetic Newer Volcanic Field stretches from the central part of the state to the western border. A 1998 paper by Sutherland proposed a plume model for recent volcanic activity in Australia and a timeline for future activity. [7] Yugembah (also known as Yugumbir, Jugambel, Jugambeir, Jugumbir, Jukam, Jukamba) is one of the Australian Aboriginal languages in areas that include the Tweed River Valley, Gold Coast, Logan, Scenic Rim, Albert River, Beaudesert, Beenleigh, Coolangatta, Coomera, Logan River, Pimpama and Tamborine, within the local government boundaries of the City of Gold Coast, City of Logan, Scenic Rim Regional Council and the Tweed River Valley. Photo courtesy Tropical North Queensland. A map showing the area at Pottsville which has been declared a dog prohibited zone. Total volume erupted is around 20,000 km3. Over the past 20 million years the vast majority of the material ejected by the Tweed Volcano has been eroded away by the Rous and Oxley rivers which feed into the the Tweed River which ultimately winds its way across the valley floor eventually entering the sea at Tweed Heads. Less than 110 km, and we have standard intraplate basaltic volcanic activity. Downstream, Korumbyn Creek and then the Oxley River enters the river at Byangum, before it flows through Murwillumbah. Queensland is now moving toward an underlying thermal plume system. [16] The southern Gold Coast beaches were soon faced with intense erosion during storms which was not replenished. Past activity throughout the zone dates from 70 Ma to as recent as 4,300 years ago. The problem with the hot spot theory is its large gaps between individual volcanoes that erupted chemically similar lavas. It dates 33 – 9 Ma and erupts leucite, a basalt high in … Regional locality map with clickable links. The estuary of the Tweed River is an important shorebird habitat. Unlike relatively static Antarctica, the movement of the plate is so fast to the north that volcanic activity is sporadic, not unlike what we see with the Hawaiian Islands – a few million years of activity before the activity migrates to the next location. [3] From the middle reaches of its course, the state boundary between New South Wales and Queensland is located approximately 10 kilometres (6.2 mi) north of the Tweed River. To the South extends a Sandy Beach of about 3 ½ miles ending in a low sandy Point off which brakers seem to extend about ¾ of a mile. Image courtesy Meeuws, et all. Image courtesy Michael Heads. For an ancient and remote continent, Australia has a remarkable history. ( Log Out /  Tweed Valley, that’s where we went, about 20 million years ago was a huge shield volcano that stretched from Nerang to Byron Bay. This is the 2,000 km long newly named Cosgrove volcanic track. http://www.mantleplumes.org/WebDocuments/Davies2014.pdf. Like neighboring Antarctica, it appears that volcanic activity is driven by the ability of underlying mantle plumes / hot spots or low velocity zones to move magma into areas of weakness in the overlying plate. It is the largest exposure of dolerite in the world (30,000 km2). Warning. I will break it into a series of several posts not unlike what I did with Antarctica. Mount Warning, Lamington Plateau and the Border Ranges between New South Wales and Queensland are among the remnants of this volcano that was originally over 100 kilometres (62 mi) in diameter and nearly twice the height of Mount Warning today, at 1,156 metres (3,793 ft). Australia is home to at least four self-contained and part of a fifth Large Igneous Provinces (LIPs) active over the last billion years. https://www.australiangeographic.com.au/topics/science-environment/2017/05/volcanic-victoria/. 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